YARN-1036. Distributed Cache gives inconsistent result if cache files get deleted from task tracker. Contributed by Mayank Bansal and Ravi Prakash


git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23@1513636 13f79535-47bb-0310-9956-ffa450edef68
YARN-543. Shared data structures in Public Localizer and Private Localizer are not Thread safe. Contributed by Omkar Vinit Joshi and Mit Desai


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Merge remote branch 'origin/branch-0.23' into branch-0.23-gd
Merge remote branch 'origin/branch-0.23-gd' into fb-YAHOO-234-branch-0.23-gd